US2669604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and means for determining deviations in the amount of frequency variation between telegraph transmitters and receivers
Assignee: Siemens and Halske AG
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Filing: 1950-11-29
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Granted: 1954-02-16
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Expires: 1970-11-29
Abstract
No abstract record available.
Inventors
- 👤 Heuschmann Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:21
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/40; H03; H03J; H03J7/00; H03J7/02; H03J7/04; H04; H04L; H04L27/00; H04L27/10; H04L27/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-15 | 1957-08-17 | 1958-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-15 | 1961-08-17 | 1962-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-15 | 1965-08-17 | 1966-02-16 | $7700.00 | Window Closed / Lapsed |